/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under 
 * the Apache License, Version 2.0  (the "License"); you may not use this file
 * except in compliance with the License.  
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>

#include "bstrlib.h"

#include "log.h"
#include "assertions.h"
#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "TrackingAreaUpdateRequest.h"

int
decode_tracking_area_update_request (
  tracking_area_update_request_msg * tracking_area_update_request,
  uint8_t * buffer,
  uint32_t len)
{
  uint32_t                                decoded = 0;
  int                                     decoded_result = 0;

  // Check if we got a NULL pointer and if buffer length is >= minimum length expected for the message.
  CHECK_PDU_POINTER_AND_LENGTH_DECODER (buffer, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len);

  /*
   * Decoding mandatory fields
   */
  if ((decoded_result = decode_u8_eps_update_type (&tracking_area_update_request->epsupdatetype, 0, *(buffer + decoded) & 0x0f, len - decoded)) < 0)
    return decoded_result;

  if ((decoded_result = decode_u8_nas_key_set_identifier (&tracking_area_update_request->naskeysetidentifier, 0, *(buffer + decoded) >> 4, len - decoded)) < 0)
    return decoded_result;

  decoded++;

  if ((decoded_result = decode_eps_mobile_identity (&tracking_area_update_request->oldguti, 0, buffer + decoded, len - decoded)) < 0)
    return decoded_result;
  else
    decoded += decoded_result;

  /*
   * Decoding optional fields
   */
  while (len - decoded > 0) {
    uint8_t                                 ieiDecoded = *(buffer + decoded);

    /*
     * Type | value iei are below 0x80 so just return the first 4 bits
     */
    if (ieiDecoded >= 0x80)
      ieiDecoded = ieiDecoded & 0xf0;

    switch (ieiDecoded) {
    case TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI:
      if ((decoded_result =
           decode_nas_key_set_identifier (&tracking_area_update_request->noncurrentnativenaskeysetidentifier, TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI:
      if ((decoded_result = decode_ciphering_key_sequence_number_ie (&tracking_area_update_request->gprscipheringkeysequencenumber, TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI:
      if ((decoded_result = decode_p_tmsi_signature_ie (&tracking_area_update_request->oldptmsisignature, TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI:
      if ((decoded_result = decode_eps_mobile_identity (&tracking_area_update_request->additionalguti, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI:
      if ((decoded_result = decode_nonce (&tracking_area_update_request->nonceue, TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI:
      if ((decoded_result = decode_ue_network_capability (&tracking_area_update_request->uenetworkcapability, TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI:
      if ((decoded_result = decode_tracking_area_identity (&tracking_area_update_request->lastvisitedregisteredtai, TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI:
      if ((decoded_result = decode_drx_parameter_ie (&tracking_area_update_request->drxparameter, TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI:
      if ((decoded_result =
           decode_ue_radio_capability_information_update_needed (&tracking_area_update_request->ueradiocapabilityinformationupdateneeded,
                                                                 TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI:
      if ((decoded_result = decode_eps_bearer_context_status (&tracking_area_update_request->epsbearercontextstatus, TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI:
      if ((decoded_result = decode_ms_network_capability_ie (&tracking_area_update_request->msnetworkcapability, TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI:
      if ((decoded_result = decode_location_area_identification_ie (&tracking_area_update_request->oldlocationareaidentification, TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI:
      if ((decoded_result = decode_tmsi_status (&tracking_area_update_request->tmsistatus, TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI:
      if ((decoded_result = decode_mobile_station_classmark_2_ie (&tracking_area_update_request->mobilestationclassmark2, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI:
      if ((decoded_result = decode_mobile_station_classmark_3_ie (&tracking_area_update_request->mobilestationclassmark3, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI:
      if ((decoded_result = decode_supported_codec_list (&tracking_area_update_request->supportedcodecs, TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI:
      if ((decoded_result = decode_additional_update_type (&tracking_area_update_request->additionalupdatetype, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI:
      if ((decoded_result = decode_guti_type (&tracking_area_update_request->oldgutitype, TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI, buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_VOICE_DOMAIN_PREFERENCE_AND_UE_USAGE_SETTING_IEI:
      if ((decoded_result =
          decode_voice_domain_preference_and_ue_usage_setting (&tracking_area_update_request->voicedomainpreferenceandueusagesetting, TRACKING_AREA_UPDATE_REQUEST_VOICE_DOMAIN_PREFERENCE_AND_UE_USAGE_SETTING_IEI, buffer + decoded, len - decoded)) <= 0) {
        return decoded_result;
      }

      decoded += decoded_result;
      /*
       * Set corresponding mask to 1 in presencemask
       */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_VOICE_DOMAIN_PREFERENCE_AND_UE_USAGE_SETTING_IEI;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_FEATURE_SUPPORT_IEI:
       if ((decoded_result =
           decode_ms_network_feature_support_ie(&tracking_area_update_request->msnetworkfeaturesupport,
             TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_FEATURE_SUPPORT_IEI,
             buffer + decoded, len - decoded)) <= 0) {
         return decoded_result;
//         OAILOG_FUNC_RETURN (LOG_NAS_EMM, decoded_result);
       }

       decoded += decoded_result;
       /* Set corresponding mask to 1 in presencemask */
       tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_FEATURE_SUPPORT_PRESENT;
       break;

    default:
      errorCodeDecoder = TLV_UNEXPECTED_IEI;
      return TLV_UNEXPECTED_IEI;
    }
  }

  return decoded;
}

int
encode_tracking_area_update_request (
  tracking_area_update_request_msg * tracking_area_update_request,
  uint8_t * buffer,
  uint32_t len)
{
  int                                     encoded = 0;
  int                                     encode_result = 0;

  /*
   * Checking IEI and pointer
   */
  CHECK_PDU_POINTER_AND_LENGTH_ENCODER (buffer, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len);
  *(buffer + encoded) = ((encode_u8_eps_update_type (&tracking_area_update_request->epsupdatetype) & 0x0f) << 4) | (encode_u8_nas_key_set_identifier (&tracking_area_update_request->naskeysetidentifier) & 0x0f);
  encoded++;

  if ((encode_result = encode_eps_mobile_identity (&tracking_area_update_request->oldguti, 0, buffer + encoded, len - encoded)) < 0)    //Return in case of error
    return encode_result;
  else
    encoded += encode_result;

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT) {
    if ((encode_result = encode_nas_key_set_identifier (&tracking_area_update_request->noncurrentnativenaskeysetidentifier, TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT) {
    if ((encode_result = encode_ciphering_key_sequence_number_ie (&tracking_area_update_request->gprscipheringkeysequencenumber, TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT) {
    if ((encode_result = encode_p_tmsi_signature_ie (tracking_area_update_request->oldptmsisignature, TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT) {
    if ((encode_result = encode_eps_mobile_identity (&tracking_area_update_request->additionalguti, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT) {
    if ((encode_result = encode_nonce (&tracking_area_update_request->nonceue, TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT) {
    if ((encode_result = encode_ue_network_capability (&tracking_area_update_request->uenetworkcapability, TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT) {
    if ((encode_result = encode_tracking_area_identity (&tracking_area_update_request->lastvisitedregisteredtai, TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT) {
    if ((encode_result = encode_drx_parameter_ie (&tracking_area_update_request->drxparameter, TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT) {
    if ((encode_result =
         encode_ue_radio_capability_information_update_needed (&tracking_area_update_request->ueradiocapabilityinformationupdateneeded,
                                                               TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT) {
    if ((encode_result = encode_eps_bearer_context_status (&tracking_area_update_request->epsbearercontextstatus, TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT) {
    if ((encode_result = encode_ms_network_capability_ie (&tracking_area_update_request->msnetworkcapability, TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT) {
    if ((encode_result = encode_location_area_identification_ie (&tracking_area_update_request->oldlocationareaidentification, TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT) {
    if ((encode_result = encode_tmsi_status (&tracking_area_update_request->tmsistatus, TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT) {
    if ((encode_result = encode_mobile_station_classmark_2_ie (&tracking_area_update_request->mobilestationclassmark2, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT) {
    if ((encode_result = encode_mobile_station_classmark_3_ie (&tracking_area_update_request->mobilestationclassmark3, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT) {
    if ((encode_result = encode_supported_codec_list (&tracking_area_update_request->supportedcodecs, TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT) {
    if ((encode_result = encode_additional_update_type (&tracking_area_update_request->additionalupdatetype, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT) {
    if ((encode_result = encode_guti_type (&tracking_area_update_request->oldgutitype, TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI, buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  return encoded;
}
